Biocatalytic Synthesis of Novel Partial Esters of a Bioactive Dihydroxy 4-Methylcoumarin by Rhizopus oryzae Lipase (ROL)
作者:Vinod Kumar、Divya Mathur、Smriti Srivastava、Shashwat Malhotra、Neha Rana、Suraj Singh、Brajendra Singh、Ashok Prasad、Anjani Varma、Christophe Len、Ramesh Kuhad、Rajendra Saxena、Virinder Parmar
DOI:10.3390/molecules21111499
日期:——
Highly regioselective acylation has been observed in 7,8-dihydroxy-4-methylcoumarin (DHMC) by the lipase from Rhizopus oryzae suspended in tetrahydrofuran (THF) at 45 °C using six different acid anhydrides as acylating agents. The acylation occurred regioselectively at one of the two hydroxy groups of the coumarin moiety resulting in the formation of 8-acyloxy-7-hydroxy-4-methylcoumarins, which are important bioactive molecules for studying biotansformations in animals, and are otherwise very difficult to obtain by only chemical steps. Six monoacylated, monohydroxy 4-methylcoumarins have been biocatalytically synthesised and identified on the basis of their spectral data and X-ray crystal analysis.
通过将来自米根霉的脂肪酶悬浮于四氢呋喃(THF)中,在45°C下使用六种不同的酸酐作为酰化剂,观察到7,8-二羟基-4-甲基香豆素(DHMC)的高选择性酰化反应。酰化反应选择性地发生在香豆素部分的两个羟基之一上,形成8-酰氧基-7-羟基-4-甲基香豆素,这些是研究动物中生物转化的重要生物活性分子,仅通过化学步骤非常难以获得。六种单酰化、单羟基的4-甲基香豆素已经通过生物催化合成并基于其光谱数据和X射线晶体分析得到鉴定。